initial commit / add all books

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diff --git a/1514/CH12/EX12.1/12_1.sce b/1514/CH12/EX12.1/12_1.sce
new file mode 100755
index 000000000..0f29e8f46
--- /dev/null
+++ b/1514/CH12/EX12.1/12_1.sce
@@ -0,0 +1,19 @@
+//chapter 12

+//example 12.1

+//page 364

+clear all;

+clc ;

+//given

+Av=75;//voltage gain

+R10=12;//coupling resistor in kohm

+R7=R10;

+R9=1000*R10/Av;

+printf("\nFeedback component R9 is %d ohm,select 150ohm standard value to make Av \nslightly greater than specified.",R9);

+R9=150;

+f1=100;

+XC6=1000*R10/100;

+C6=10^6/(2*%pi *f1*XC6);

+printf("\ncapacitor C6 is %.1f microF,use 15 microF standard value",C6);

+XC2=R9;

+C2=10^6/(2*%pi *f1*XC2);

+printf("\ncapacitor C2 is %.1f microF,use 15 microF standard value",C2);

diff --git a/1514/CH12/EX12.2/12_2.sce b/1514/CH12/EX12.2/12_2.sce
new file mode 100755
index 000000000..1e868dddd
--- /dev/null
+++ b/1514/CH12/EX12.2/12_2.sce
@@ -0,0 +1,49 @@
+//chapter 12

+//example 12.2

+//page 364

+clear all;

+clc ;

+//given values in ohm

+Zi2=967;

+hfe1=100;

+R3=12000;

+hie1=1000;

+R9=150;

+hfe2=100;

+hie2=1000;

+R7=R3;

+RL=120*10^3;

+R10=R7;

+R1=RL;

+R2=39*10^3;

+//voltage gain of stage 1

+A1=-hfe1*(R3*Zi2/(R3+Zi2))/(hie1+R9*(1+hfe1));

+printf("\nvoltage gain of stage 1=%.1f",A1);

+//voltage gain of stage 2

+Rp=(1/R7)+(1/RL)+(1/R10);

+A2=-hfe2*(1/Rp)/hie2;

+printf("\nvoltage gain of stage 2=%d",A2);

+//open loop gain 

+A1=-5.5;A2=-571;

+M = (A1)*(A2) ;

+printf("\nopen loop gain =%d",M);

+//feedback factor

+B=R9 /(R9 + R10);

+b=B^-1;

+printf("\nfeedback factor(beta)=1/%d",b)

+Av1=1/B;//for M*beta >>1

+Av2=M/(1+M*B);//closed loop gain

+printf("\nclosed loop gain=%d or %d if M*beta >>1",ceil(Av2),Av1);

+Zb=hie1;

+Zin=(1+M*B)*Zb;

+//input impedance

+Zi=1/((1/Zin)+(1/R1)+(1/R2))*10^-3;

+printf("\ninput impedance=%d kohm",ceil(Zi));

+//output impedance 

+Zout=(R7*R10/(R7+R10))/(1+M*B);

+printf("\noutput impedance =%d ohm",ceil(Zout));

+XC1=Zi/10;

+f1=100;//Hz

+C1=10^3/(2*%pi *f1*XC1);

+printf("\ncapacitor C1=%.2f microF,use standard value 1 microF",C1)

+

diff --git a/1514/CH12/EX12.3/12_3.sce b/1514/CH12/EX12.3/12_3.sce
new file mode 100755
index 000000000..9ae922c00
--- /dev/null
+++ b/1514/CH12/EX12.3/12_3.sce
@@ -0,0 +1,59 @@
+//chapter 12

+//example 12.3

+//page 371

+clear all;

+clc ;

+//given

+Vcc=20;//supply voltage

+Rl=500;//load resistance

+Av=75;//closed loop voltage gain

+f1=30;// i/p signal frquency Hz

+hfe=80;

+hie=1.4;

+Ve=5;Vce=3;

+VR2=5.7;

+Vbe=5;

+VR3=Vcc-Vce-Ve;

+R3=Rl/10;

+Ic=VR3/R3*10^3;

+printf("\ncollector current = %d microA,\ntoo small for operations of transistor,\nSo Ic=1 mA",Ic)

+Ic=1;

+R3=VR3/Ic;

+printf('\nR3=%d kohm which is standard value',R3)

+R45=(Ve/Ic);

+R4=1000*((R3*Rl)/(R3+Rl))/Av;

+printf("\nR4=%d ohm ,use standard value 150 ohm",R4);R4=150;

+R5=R45-R4/1000;

+printf("\nR5=%.2f kohm ,use standard value 5.6 kohm",R5);

+R5=5.6;//kohm

+//potential divider current and resistors

+I2=Ic/10;

+Ve=0.7;

+R2=(Vbe+Ve)/I2;

+printf("\nR2=%d kohm,use standard value 56 kohm",R2);R2=56;

+R1=(Vcc-VR2)/I2;

+printf("\nR1=%d kohm,use standard value 150 kohm",R1);R1=150;

+Zb=hie+(1+hfe)*R4/1000;

+//input impedance

+Zi=1/((1/Zb)+(1/R1)+(1/R2));

+printf("\ninput impedance=%.2f kohm",(Zi));

+//capacitance

+XC1=Zi/10;

+XC1=1;

+C1=10^3/(2*%pi *f1*XC1);

+printf("\ncapacitor C1=%.1f microF,use standard value 5.6 microF",(C1))

+XC2=R4;

+C2=10^6/(2 * %pi *f1* XC2);

+printf("\ncapacitor C2=%.1f microF,use standard value 39 microF",C2)

+C3=10^3/(2*%pi *f1*Rl/10);

+printf("\ncapacitor C3=%.3f microF,use standard value 0.1 microF",C3)

+

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